1000MW超超临界锅炉低NO_x燃烧技术改造及性能优化试验  

Retrofit with Low NO_x Combustion Technique and Performance Optimization Test for a 1000-MW Ultra Supercritical Boiler

作　　者：邹磊[1] 岳峻峰[1] 陈永生 梁绍华[1] 许亦然 张恩先[1] 

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102 [2]国电泰州发电有限公司,江苏泰州225327

出　　处：《中国电力》2014年第10期92-97,共6页Electric Power

摘　　要：为降低NOx排放,某电厂对其1 000 MW超超临界锅炉进行了低NOx燃烧技术改造。改造后锅炉NOx排放质量浓度较改造前降低42%,但CO排放质量浓度、飞灰含碳质量分数较改造前均有上升。在分析改造前后锅炉燃烧工况变化的基础上进行了燃烧调整试验,通过改变省煤器出口O2体积分数、二次风配风方式、OFA风量和SOFA风量,研究了不同工况下锅炉燃烧及NOx排放特性。调整后锅炉在高负荷下CO排放质量浓度降至100 mg/m3以下,飞灰含碳质量分数降至1%以下。The technical retrofit adopting low NOx combustion technology was carried out for a 1 000-MW ultra supercritical boiler to reduce the NOx emissions.After the retrofit,the NOx emission mass concentration was down by 42%,while the CO emission mass concentration and the carbon content of fly ash were higher.Therefore,based on the analysis of the variation of the combustion conditions before and after the retrofit,the combustion adjustment test was conducted,in which the boiler combustion and NOx emission characteristics under different working conditions were studied by changing the oxygen volumetric fraction at the economizer exit,the secondary air distribution mode,the OFA flow rate and the SOFA flow rate.The test results show that the CO emission mass concentration has been dropped to less than 100 mg/m3 and the carbon content of fly ash has been down below 1% under high boiler load after the combustion adjustment.

关 键 词：超超临界锅炉 低NOx燃烧技术改造 NOX排放 燃烧调整 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]